有机-无机复合载体茂锆催化剂的制备及乙烯聚合

SYNTHESIS OF ORGANIC-INORGANIC HYBRID SUPPORTED ZIRCONOCENE CATALYST AND ITS CATALYSIS ON ETHYLENE POLYMERIZATION

合成了组成为聚(4-乙烯基吡啶)-硅胶(SAV)的有机-无机复合载体茂锆催化剂,并用固体13C-NMR谱、元素分析(EA)、光电子能谱(XPS)等方法进行了表征.发现由SAV负载的茂锆催化剂可在相对较低的甲基铝氧烷(Al/Zr=600)用量下聚合乙烯.其活性(1.12×103kg PE/mol Zr.h)远高于SiO2负载的茂锆催化剂(0.22×103kg PE/mol Zr.h).

Organic-inorganic hybrid （SAV） supported zirconocene was synthesized and its catalysis on ethylene polymerization was examined. The SAV was synthesized by copolymerization of 4-vinylpyridine with vinyl silica monomer （SA）,which was modified by reacting silica with allyhrimethoxysilane （APS）. After treated by MAO, the SAV was reacted with Cp2ZrCl2 to form organic-inorganic hybrid supported metallocene. The chemical structure and the composition of SA and SAV have been characterized by solid-state 13 C-NMR, XPS, and elemental analysis （EA）. The SAV supported zirconocene catalyst was effective in ethylene polymerization at a relatively low MAO level （Al/Zr = 600） giving higher activity than that supported by SiO2.